Section 1 Electrical Installation

101. General

1. General

(1) The requirements in this Chapter apply to the electrical installations of the platform.

Components of the drilling and production systems are not covered by these requirements.

(2) Electrical installations are to comply with the requirements of standards recognized by the Society.

2. Plans and documents to be submitted

The following plans and documents are to be submitted in triplicate to the Society.

(1) Generators and motors

Complete rating, class of insulation and rated ambient temperature, rated temperature rise and

standard to which manufactured.

(2) Switchgear and switchboards

Arrangements and details, front view, installation arrangements and wiring diagram including a schematic diagram.

(3) Motor-control equipment

Terminal arrangements, degree of enclosure and wiring diagram.

(4) Wiring

Plans of all wiring, complete feeder list, giving for each feeder and branch circuit the load, wire size, type of wire or cable, rating or setting of circuit breakers, rating of fuses and switches, interrupting capacity of circuit breakers and fuses.

(5) Short-circuit data

Data are to be submitted giving the maximum calculated short-circuit current at each point in the distribution system.

(6) Hazardous areas

A plan showing the electrical equipment installed in hazardous areas(see Pt 7, Ch 1, Sec 11

of Rules for Classification of Steel Ships).

(7) Cathodic protection

Details of impressed-current-cathodic protection system.

(8) Other plans and documents deemed necessary by the Society

102. Electrical Installations

1. General consideration

(1) Watertight or weatherproof equipment

Electrical equipment exposed to the weather or located where it would be exposed to other se- vere moisture conditions is to be weatherproof or watertight.

(2) Corrosion-resistant parts

Enclosures, working and other parts of electrical equipment which would be damaged or ren- dered ineffective by corrosion are to be made of corrosion-resistant materials or of material ren-

dered corrosion-resistant.

(3) Grounding arrangements

(A) Where not obtained through normal construction, arrangements are to be provided to effec- tively ground all machinery, metal structures of derricks, masts and helicopter platforms.

(B) Grounding arrangements are to be provided for tending vessels.

(4) Standards

Standards recognized by the Society are to be complied with in the manufacture and testing of

motors, generators, cables and wiring, and also in the provision of overload, over-current short-circuit protection.

2. Installations in hazardous areas

and

(1) Installations in hazardous areas are to comply with Pt 7, Ch 1, Sec 11 of Rules for

Ch 6 Electrical Installations, Safety Features and Fire Protection Ch 6

Classification of Steel Ships.

(2) In general, equipment in hazardous areas is to be explosion-proof, intrinsically safe, or purged and pressurized.

(3) Explosion-proof and intrinsically safe equipment is to be of an approved type. Purged and pres- surized equipment is to comply with a recognized standard.

3. Auxiliary power supply

An auxiliary power supply is to be provided. The auxiliary power supply is to have a capacity suf- ficient to power all electrical equipment required to maintain safety of operations in the event of failure in the primary electrical power supply.

4. Emergency source of power for manned platforms

(1) General

A self-contained emergency source of power is to be installed in a non-hazardous space. Its lo- cation and arrangement are to be such as to insure that a fire or other failure in a space con- taining the main source, the auxiliary source, or in any space containing internal combustion machinery, any oil-fired boiler or oil fuel unit will not interfere with the supply or distribution of emergency power.

(2) Power supply

The power available is to be sufficient to supply for at least 18 hours all services necessary for safety in an emergency, particular attention being given to the following.

(A) Navigation and special purpose lights and warning systems including helicopter landing lights.

(B) Emergency lighting for machinery spaces, control stations, alleyways, stairways and exits.

(C) General alarm and communications system.

(D) Fire detection and alarm system.

(E) Fire extinguishing systems.

(F) Permanently installed lifting gear for diving bell if dependent on the platform's electrical power.

(G) Abandonment systems dependent on electric power including lighting for embarkation stations.

(H) The capability of closing the blow-out prevention control system.

(3) Testing

Means are to be provided for periodic testing of the emergency source of power and is to in- clude the testing of automatic arrangements.

5. Emergency shutdown facilities

Arrangements are to be provided for the selective disconnection or shutdown of the following from an emergency control station.

(A) Ventilating system

(B) Non-essential electrical equipment

(C) Essential electrical equipment

(D) Emergency equipment except battery-supplied lighting and radio

(E) Generator prime movers